Hi,
I am using Hibernate 4.3.5 with Firebird 2.5 and I am facing a problem with a oneToMany association with the annotation @MapKey I guess.

Here are my entities:

@Entity
@SequenceGenerator( name = "configDataIdGen", sequenceName = "SEQUENCE_TABLE" )
public class TRM_ConfigData
{

/**
* The persistence identifier
*/
@Id
@GeneratedValue( strategy = GenerationType.SEQUENCE, generator = "configDataIdGen" )
@Column( name = "id", nullable = false, updatable = false )
private long id;

/**
* Map of streams (key=stream boid, value=stream)
*/
@OneToMany( cascade = { CascadeType.ALL }, orphanRemoval = true )
@JoinTable( name = "CONFIG_STREAM", joinColumns = @JoinColumn, inverseJoinColumns = @JoinColumn( name = "STREAM_ID" ) )
@MapKey( name = "m_boid" )
private Map<String, TRM_Stream> m_boidToStream = new HashMap<String, TRM_Stream>();

....

@Entity
@PrimaryKeyJoinColumn( name = "id" )
public class TRM_Stream extends TRM_Resource
{

}


@Entity
@PrimaryKeyJoinColumn( name = "id" )
public abstract class TRM_Resource extends B_ManagedBusinessObject implements Cloneable, Comparable
{

}

@Entity
@SequenceGenerator( name = "managedBusinessObjectIdGen", sequenceName = "SEQUENCE_TABLE" )
@Inheritance( strategy = InheritanceType.JOINED )
public abstract class B_ManagedBusinessObject extends XmlObjectIdentifier implements BoidInterface, Serializable
{

/**
* The persistence identifier
*/
@Id
@GeneratedValue( strategy = GenerationType.SEQUENCE, generator = "managedBusinessObjectIdGen" )
@Column( name = "id", nullable = false, updatable = false )
private long id;

/**
* from the property name (see get and set) then this property will not be exportable by xml.
*/
protected String m_boid;


When I run my application, I have the following error:

Caused by: org.firebirdsql.jdbc.FBSQLException: GDS Exception. 335544569. Dynamic SQL Error
SQL error code = -206
Column unknown
A1.M_BOID
At line 1, column 111

The logging SQL is a bit strange:

Hibernate: select m_boidtost0_.TRM_ConfigData_id as TRM_Conf1_6_0_, m_boidtost0_.STREAM_ID as STREAM_I2_4_0_, (select a1.m_boid from TRM_Stream a1 where a1.id=m_boidtost0_.STREAM_ID) as formula0_0 ......

Hibernate seems to search for the attribute m_boid in the class TRM_Stream where as this attrribute belongs to its parent class B_ManagedBusinessObject.

So my question are :
When the key in a map is not a primary key, should the attribute necessary be an attribute of the entity ?
Why Hibernate does not detect that this attribute belongs to the parent abstract class ?

Thanks for your help
Benoit